Machine for mortising doors for locks



PATENT OFFICE.

TYRE N. ANDREWS, OF SAN FRANCISCO, CALIFORNIA.

MACHINE FOR MORTISING DOORS FOR LQCKS.

SPECIFICATION forming part of Letters Patent No. 247,149, dated September 20, 1.881.

Application filed February 19, 1881. (No model.)

To all whom it may concern Be it known that I, TYRE N. ANDREWS, of the city and county of San Francisco, State of California, have invented a Boring-Machine for Mortise-Locks; and I hereby declare the following to be a fnll,clear, and exact description thereof.

My invention relates to a boring-machine for mortise-locks and it consists in a mechanism for simultaneously actuating a series of angers or bits to bore the holes in the edge of the door, and a means for firmly'securing the machine to the door, whereby a mortise may be formed upon a door already hung, and both hands are left free to operate the machine, and also a means for withdrawing the angers by reversing the cranks, all of which will hereinafter more particularly appear.

Referring to the accompanying drawings, Figure 1 is a perspective view of my machine. Fig. 2 is a longitudinal vertical section.

Let A represent a frame open at the sides, and having elongated holes in its ends, as shown. Its upper and lower sides are grooved,

so as to form the guides O, on which the central piece or bit-carrier, D, slides. The rear side of the piece D has the supports E,in which the crank-shaft F is journaled. The outer ends of the shaft F are fitted with the cranks q, one on each side of the frame A, and oppositely placed, as shown. Upon the crank-shaft F, and between the supports E, is secured the bevel-gear wheel G. The piece or blockD has in its forward end a chamber having the walls a, through which are journaled the shafts H. In this case I have shown five, the middle one of which projects through the carrier-frame sufficiently to have secured to it the bevelgear wheel I, which meshes with the bevelgear G. The shafts H have secured to them the spur-pinions, which mesh so that all the shafts H and bits will be driven simultaneously. The forward ends of the shafts H are formed with sockets J, in usual form, for receiving the angers. It will be seen that in the revolution communicated to these braces thus, two will revolve in one direction and three in the other, thus necessitating the use of two left-hand angers. The angers are inserted in these sockets andextend out through the elongated opening in the end of the frame A.

In order to allow the use of both hands, I have provided a clamp, K, set on theupper front side of the frame A, as shown. This clamp K consists of two projecting arms, L. A pin or bolt, 0, passes through their rear ends, and serves as a guide, being fixed to one of the arms, while the other slides upon it. A thumb-screw, N, having right and left out threads at its end and head, respectively, passes through both arms above their center, whereby the arms are drawn together and kept in the middle of the frame A. The center of the screw is jouinaled in a lug, 0, upon the top of the frame, so that the screw remains stationary and the jaws of the clamp travel upon it to and from the center. By turning the thumb-screw N the arms are brought together or forced apart to clasp the edge of the door and secure the machine tightly when in operation.

To assistin securing the machine to the door, I have a small pin, 1?, at the lower end of the frame A, which, by being forced in the door, serves to lend additional support.

In order to withdraw the angers, I have attached the horizontal rack-bar Q to one side of the frame A, its upper surface having teeth, as shown. I place a loose gear-wheel, R, upon the crank-shaft F, which is made square at that part, so that the gear-wheel It, though capable of sliding back and forth, cannot turn round, except with the shaft F. This gearwheel B, when pushed in to engage with the teeth upon the horizontal bar Q, locks the crank-shaft, so that when the cranks are turned the entire center block or carrier, 1), travels upon the bar and withdraws the angers. When the shaft is so locked the forward or backward revolution of the cranks will push forward or withdrawtheoperatingdevice within the frame. When the angers are boring the gear-wheelR is moved away from the rack and the block D is carried forward by the feed of the angers themselves.

I am aware that boring devices have been used in which two or more angers have been supported ina frame and driven by cranked ets, driving-gears, and cranks, supported in 15 the carrier, which slides in an outer frame, A,

in combination with the toothed rack Q, upon the outer frame, and the pinion R, upon the crank-shaft, which may be thrown into gear l with the rack to withdraw the boring-tools, and 20 the frame A, having the clamping-jaws L, substantially as herein described.

In witness whereof I have hereunto set my hand.

:T. N. ANDREWS. r Witnesses:

S. H. NoURsE,

WM. F. Boorrn. 

